In the last year the use of virtualization has continued to expand beyond its server roots and, more recently, virtual desktop infrastructure, into other areas of IT infrastructure such as networking and data storage. And like so many other data center offerings, developers of virtualization technologies are increasingly turning to the cloud to deliver their services.

Virtualization remains one of the hottest segments of the IT industry. Here CRN presents its annual list of the virtualization vendors -- established players and the startups – that need to be on the channel's radar.